package com.example.coolweatherxdz;
import android.app.ProgressDialog;
import android.content.Intent;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;
import androidx.fragment.app.Fragment;
import com.example.coolweatherxdz.db.City;
import com.example.coolweatherxdz.db.County;
import com.example.coolweatherxdz.db.Province;
import com.example.coolweatherxdz.gson.Weather;
import com.example.coolweatherxdz.util.HttpUtil;
import com.example.coolweatherxdz.util.Utility;
import org.litepal.crud.DataSupport;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import okhttp3.Call;
import okhttp3.Callback;
import okhttp3.Response;

/***
 * 遍历省市县数据的碎片
 */
public class ChooserAreaFragment extends Fragment {
    private static final String TAG = "ChooseAreaFragment";
    public static final int LEVEL_PROVINCE = 0;
    public static final int LEVEL_CITY = 1;
    public static final int LEVEL_COUNTY = 2;
    //加载对话框
    private ProgressDialog progressDialog;
    //标题文字
    private TextView titleText;
    //返回按钮
    private Button backButton;
    //城市列表
    private ListView listView;
    //list的适配器
    private ArrayAdapter<String> adapter;
    //数据列表
    private List<String> dataList = new ArrayList<>();
    //省的列表
    private List<Province> provinceList;
    //城市列表
    private List<City> cityList;
    //县级列表
    private List<County> countyList;
    //被选中的省
    private Province selectedProvince;
    //被选中的市
    private City selectedCity;
    //当前选中的级别
    private int currentLevel;
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        //初始化页面
        View view = inflater.inflate(R.layout.choose_area, container, false);
        //初始化控件
        titleText =  view.findViewById(R.id.title_text);
        backButton =  view.findViewById(R.id.back_button);
        listView =  view.findViewById(R.id.list_view);
        //创建适配器
        adapter = new ArrayAdapter<>(getContext(), android.R.layout.simple_list_item_1, dataList);
        //将适配器设置list
        listView.setAdapter(adapter);
        return view;
    }

    @Override
    /***
     *当活动创建的时候
     */
    public void onActivityCreated(Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);
        //给list得所有item设置点击事件
        listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                //判断被点击的级别
                if (currentLevel == LEVEL_PROVINCE) {
                    selectedProvince = provinceList.get(position);
                    queryCities();
                } else if (currentLevel == LEVEL_CITY) {
                    selectedCity = cityList.get(position);
                    queryCounties();
                }else if (currentLevel==LEVEL_COUNTY){
                    //如果是县级进入城市天气
                    String weatherId = countyList.get(position).getWeatherId();
                    if (getActivity() instanceof MainActivity){
                        Intent intent = new Intent(getActivity(), WeatherActivity.class);
                        intent.putExtra("weather_id",weatherId);
                        startActivity(intent);
                        getActivity().finish();
                    }else if (getActivity() instanceof WeatherActivity){
                        WeatherActivity weatherActivity = (WeatherActivity) getActivity();
                        weatherActivity.drawerLayout.closeDrawers();
                        weatherActivity.swipeRefreshLayout.setRefreshing(true);
                        weatherActivity.requestWeather(weatherId);
                    }


                }

            }
        });
        /**
         * 返回按钮的点击事件
         * 判断当前是处于哪一个级别当中,如果是在市级城市中就进行省级城市的查询
         */
        backButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                //判断级别,返回查询下一级别的城市
                if (currentLevel == LEVEL_COUNTY) {
                    queryCities();
                } else if (currentLevel == LEVEL_CITY) {
                    queryProvinces();
                }
            }
        });
        queryProvinces();
    }

    /**
     * 查询全国所有的省，优先从数据库查询，如果没有查询到再去服务器上查询。
     */
    private void queryProvinces() {
        titleText.setText("中国");
        //将返回按钮设置不可见
        backButton.setVisibility(View.GONE);
        //查询数据中所有的省级城市
        provinceList = DataSupport.findAll(Province.class);
        //判断是否在数据库中查询到
        if (provinceList.size() > 0) {
            //清除数据列表
            dataList.clear();
            //迭代遍历省级城市
            for (Province province : provinceList) {
                dataList.add(province.getProvinceName());
            }
            //适配器,发出通知
            adapter.notifyDataSetChanged();
            listView.setSelection(0);
            //赋值被选中的级别
            currentLevel = LEVEL_PROVINCE;
        } else {
            //否则就去服务器查询数据,提供url 以及要查询的级别
            String address = "http://guolin.tech/api/china";
            queryFromServer(address, "province");
        }
    }

    /**
     * 查询选中省内所有的市，优先从数据库查询，如果没有查询到再去服务器上查询。
     */
    private void queryCities() {
        titleText.setText(selectedProvince.getProvinceName());
        backButton.setVisibility(View.VISIBLE);
        //数据库查询
        cityList = DataSupport.where("provinceid = ?", String.valueOf(selectedProvince.getId())).find(City.class);
        if (cityList.size() > 0) {
            dataList.clear();
            for (City city : cityList) {
                dataList.add(city.getCityName());
            }
            adapter.notifyDataSetChanged();
            listView.setSelection(0);
            currentLevel = LEVEL_CITY;
        } else {
            //联网查询
            int provinceCode = selectedProvince.getProvinceCode();
            String address = "http://guolin.tech/api/china/" + provinceCode;
            queryFromServer(address, "city");
        }
    }

    /**
     * 查询选中市内所有的县，优先从数据库查询，如果没有查询到再去服务器上查询。
     */
    private void queryCounties() {
        titleText.setText(selectedCity.getCityName());
        backButton.setVisibility(View.VISIBLE);
        //数据库查询
        countyList = DataSupport.where("cityid = ?", String.valueOf(selectedCity.getId())).find(County.class);
        if (countyList.size() > 0) {
            dataList.clear();
            for (County county : countyList) {
                dataList.add(county.getCountyName());
            }
            adapter.notifyDataSetChanged();
            listView.setSelection(0);
            currentLevel = LEVEL_COUNTY;
        } else {
            int provinceCode = selectedProvince.getProvinceCode();
            int cityCode = selectedCity.getCityCode();
            String address = "http://guolin.tech/api/china/" + provinceCode + "/" + cityCode;
            queryFromServer(address, "county");
        }
    }

    /**
     * 根据传入的地址和类型从服务器上查询省市县数据。
     */
    private void queryFromServer(String address, final String type) {
        showProgressDialog();
        HttpUtil.sendOkHttpRequest(address, new Callback() {
            @Override
            public void onResponse(Call call, Response response) throws IOException {
                String responseText = response.body().string();
                boolean result = false;
                /**
                 * 通传进来的级别进行判断,并且将其按照级别进行解析
                 */
                if ("province".equals(type)) {
                    result = Utility.handleProvinceResponse(responseText);
                } else if ("city".equals(type)) {
                    result = Utility.handleCityResponse(responseText, selectedProvince.getId());
                } else if ("county".equals(type)) {
                    result = Utility.handleCountyResponse(responseText, selectedCity.getId());
                }
                if (result) {
                    /**
                     * 因为牵扯到UI的更新问题,所以需要通过runOnUiThread切换到主线程
                     * 然后再进行判断,对级别进行查询,这时候数据库中已经存在数据了
                     */
                    getActivity().runOnUiThread(new Runnable() {
                        @Override
                        public void run() {
                            closeProgressDialog();
                            if ("province".equals(type)) {
                                queryProvinces();
                            } else if ("city".equals(type)) {
                                queryCities();
                            } else if ("county".equals(type)) {
                                queryCounties();
                            }
                        }
                    });
                }
            }

            @Override
            public void onFailure(Call call, IOException e) {
                // 通过runOnUiThread()方法回到主线程处理逻辑
                getActivity().runOnUiThread(new Runnable() {
                    @Override
                    public void run() {
                        closeProgressDialog();
                        Toast.makeText(getContext(), "加载失败", Toast.LENGTH_SHORT).show();
                    }
                });
            }
        });
    }

    /**
     * 显示进度对话框
     */
    private void showProgressDialog() {
        if (progressDialog == null) {
            progressDialog = new ProgressDialog(getActivity());
            progressDialog.setMessage("正在加载...");
            progressDialog.setCanceledOnTouchOutside(false);
        }
        progressDialog.show();
    }

    /**
     * 关闭进度对话框
     */
    private void closeProgressDialog() {
        if (progressDialog != null) {
            progressDialog.dismiss();
        }
    }

}
